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Introduction to the SSL Network Extender
Whenever users access the organization from remote locations, it is essential that not only the usual requirements of secure connectivity be met but also the special demands of remote clients. These requirements include:
To resolve these issues, a secure connectivity framework is needed to ensure that remote access to the corporate network is securely enabled.
The SSL (Secure Socket Layer) Network Extender is a simple-to-implement remote access solution. A thin client is installed on the user's machine. (The SSL Network Extender client has a much smaller size than other clients.) It is connected to an SSL enabled web server that is part of the Enforcement Module. By default, the SSL enabled web server is disabled. It is activated by using the SmartDashboard, thus enabling full secure IP connectivity over SSL. The SSL Network Extender requires a server side configuration only, unlike other remote access clients. Once the end user has connected to a server, the thin client is downloaded as an ActiveX component, installed, and then used to connect to the corporate network using the SSL protocol.
It is much easier to deploy a new version of the SSL Network Extender client than it is to deploy a new version of other conventional clients.
Note - If the Mobile Access blade is active on a Security Gateway, SSL Network Extender works through Mobile Access and not IPsec VPN. In this case, SSL Network Extender must be configured through the Mobile Access blade. If you already had SSL Network Extender configured on an IPsec VPN Security Gateway and then you enable the Mobile Access blade, you must reconfigure SSL Network Extender for the Mobile Access blade.
How the SSL Network Extender Works
The SSL Network Extender is a thin client installed on the user's computer and an SSL enabled web server component, integrated into the Security Gateway.
To enable connectivity for clients using the SSL Network Extender, a Security Gateway must be configured to support Remote Access Clients, in addition to a minor configuration specific to SSL Network Extender.
Users download SSL Network Extender from a Security Gateway portal.
Commonly Used Concepts
This section briefly describes commonly used concepts that you will encounter when dealing with the SSL Network Extender. It is strongly recommended that you review the 'Remote Access VPN' section of this bookbefore reading this guide.
Remote Access VPN
Refers to remote users accessing the network with client software such as Endpoint VPN clients, SSL clients, or third party IPsec clients. The Security Gateway provides a Remote Access Service to the remote clients.
Remote Access Community
A Remote Access Community, a Check Point concept, is a type of VPN community created specifically for users that usually work from remote locations, outside of the corporate LAN.
Office Mode
Office Mode is a Check Point remote access VPN solution feature. It enables a Security Gateway to assign a remote client an IP address. This IP address is used only internally for secure encapsulated communication with the home network, and therefore is not visible in the public network. The assignment takes place once the user connects and authenticates. The assignment lease is renewed as long as the user is connected. The address may be taken either from a general IP address pool, or from an IP address pool specified per user group, using a configuration file.
Visitor Mode
Visitor Mode is a Check Point remote access VPN solution feature. It enables tunneling of all client-to-Security Gateway communication through a regular TCP connection on port 443. Visitor mode is designed as a solution for firewalls and Proxy servers that are configured to block IPsec connectivity.
Endpoint Security on Demand
Endpoint Security on Demand (ESOD) may be used to scan endpoint computers for potentially harmful software before allowing them to access the internal application. When end users access the SSL Network Extender for the first time, they are prompted to download an ActiveX component that scans the end user machine for Malware. The scan results are presented both to the Security Gateway and to the end user. SSL Network Extender access is granted/denied to the end user based on the compliance options set by the administrator.
ESOD Policy per User Group
Since there are many different kinds of threats to your network's security, different users may require different configurations in order to guard against the increasing number and variety of threats. The ability to configure a variety of ESOD policies enables the administrator to customize the software screening process between different user groups.
Screened Software Types
ESOD can screen for the Malware software types listed in the following table:
Special Considerations for the SSL Network Extender
This section lists SSL Network Extender special considerations, such as pre-requisites, features and limitations:
Pre-Requisites
The SSL Network Extender pre-requisites are listed below:
Client-side Pre-Requisites
The SSL Network Extender client-side pre-requisites for remote clients are:
Server-Side Pre-Requisites
The SSL Network Extender server-side pre-requisites are listed below:
Features
The SSL Network Extender features are listed below:
Configuring SSL Network Extender
The following sections describe how to configure the server. Load Sharing Cluster Support, customizing the Web GUI, upgrading the SSL Network Extender client and Installation for Users without Administrator privileges are also discussed.
Configuring the Server
Before configuring the server, verify that you have a valid license for the SSL Network Extender.
Use
cpconfig to verify that you have a valid license for the SSL Network Extender. Check Point software is activated with a License Key. You can obtain this License Key by registering the Certificate Key that appears on the back of the software media pack, in the Check Point Support Center.
Server-Side Configuration
The SSL Network Extender requires only server side configuration
Configuring the Security Gateway for a Remote Access Community
Make sure that the VPN Software Blade is enabled before you configure the Remote Access community.
To configure the Security Gateway for Remote Access:
Configuring the Security Gateway to Support the SSL Network Extender
Note - If the Mobile Access blade is active on a Security Gateway, SSL Network Extender works through Mobile Access and not IPsec VPN. In this case, SSL Network Extender must be configured through the Mobile Access blade. If you already had SSL Network Extender configured on an IPsec VPN Security Gateway and then you enable the Mobile Access blade, you must reconfigure SSL Network Extender for the Mobile Access blade.
Configure each Security Gateway that uses SSL Network Extender. When the Mobile Access Software Blade is enabled, SSL Network Extender is enabled as a Web client.
To configure the SSL Network Extender settings for a Security Gateway:
Configuring SSL Network Extender
To configure the settings for SSL Network Extender connections:
Management of Internal CA Certificates
If the administrator has configured Certificate with Enrollment as the user authentication scheme, users can create a certificate for their use, by using a registration key, provided by the system administrator.
To create a user certificate for enrollment:
Fetching the XML Configuration File
After installing the ESOD server and configuring it, fetch the XML config file from the ESOD server:
Upgrading ESOD
Note - At present, the Dynamic ESOD Update feature is not supported.
You can manually upgrade ESOD as follows:
Configuring ESOD Policies
On the Security Management Server:
Note - Make sure that Endpoint Security on Demand is enabled in the Global Properties > Remote Access > SSL Network Extender page.
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On the Security Gateway:
For troubleshooting tips, see Troubleshooting.
Customizing the SSL Network Extender Portal
You can modify the SSL Network Extender Portal by changing skins and languages.
Configuring the Skins Option
To configure the Skins Option:
The skin directory is located under
$FWDIR/conf/extender on the SSL Network Extender Security Gateways.
There are two subdirectories. They are:
Disabling a Skin
Examplecd $FWDIR/conf/extender/skin/custom
mkdir skin1
touch disable
Creating a Skin
Example
Add your company logo to the main SSL Network Extender portal page.
cd $FWDIR/conf/extender/skin/custom
mkdir <skin_name>
cd <skin_name>
copy ././chkp/skin2/* .
Place logo image file in this directory
Edit
index.css .
Goto
.company_logo and replace the existing URL reference with a reference to the new logo image file.
Save.
Install Policy.
Note - No spaces are allowed in the
<skin_name>
Configuring the Languages Option
To configure the Languages Option:
The
languages directory is located under $FWDIR/conf/extender on the SSL Network Extender Security Gateways.
There may be two subdirectories. They are:
Disabling a Language
Adding a Language
Examplecd $FWDIR/conf/extender/language
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mkdir custom
cd custom
mkdir <language_name>
cd <language_name>
copy ././chkp/english/messages.js
Editthe
messages.js file andtranslate the text bracketed by quotation marks.
Save.
In
custom/english/messages.js , add a line as follows:
<language_name>='translation of language_name';
Install Policy.
Note - No spaces are allowed in the
<language_name>
Modifying a Language
Installation for Users without Administrator Privileges
The SSL Network Extender usually requires Administrator privileges to install the ActiveX component. To allow users that do not have Administrator privileges to use the SSL Network Extender, the Administrator can use his/her remote corporate installation tools (such as, Microsoft SMS) to publish the installation of the SSL Network Extender, as an MSI package, in configuring the SSL Network Extender.
To prepare the SSL Network Extender MSI package:
On Windows , Mac and Linux, it is possible to install SSL Network Extender for users that are not administrators, if the user knows the admin password. In this case, perform a regular SSL Network Extender installation and supply the administrator password when asked. Sketchup for students free.
SSL Network Extender User Experience
This section describes the user experience, including downloading and connecting the SSL Network Extender client, importing a client certificate, and uninstalling on disconnect.
Configuring Microsoft Internet Explorer
Check Point SSL Network Extender uses ActiveX controls and cookies to connect to applications via the Internet. These enabling technologies require specific browser configuration to ensure that the applications are installed and work properly on your computer. The Trusted Sites Configuration approach includes the SSL Network Extender Portal as one of your Trusted Sites. This approach is highly recommended, as it does not lessen your security. Please follow the directions below to configure your browser.
Trusted Sites Configuration
About ActiveX Controls
ActiveX controls are software modules, based on Microsoft's Component Object Model (COM) architecture. They add functionality to software applications by seamlessly incorporating pre-made modules with the basic software package.
On the Internet, ActiveX controls can be linked to Web pages and downloaded by an ActiveX-compliant browser. ActiveX controls turn Web pages into software pages that perform like any other program.
The SSL Network Extender can use ActiveX control in its applications. To use ActiveX you must download the specific ActiveX components required for each application. Once these components are loaded, you do not need to download them again unless upgrades or updates become available. If you do not want to use an ActiveX component you may work with a Java Applet.
Note - You must have Administrator rights to install or uninstall software on Windows XP Professional, as well as on the Windows 2000 operating systems.
Downloading and Connecting the Client
The following section discusses how to download and connect the SSL Network Extender.
To download the Client:
ESOD not only prevents users with potentially harmful software from accessing your network, but also requires that they conform to the corporate Anti-Virus and firewall policies, as well. A user is defined as having successfully passed the ESOD scan only if he/she successfully undergoes scans for Malware, Anti-Virus, and Firewall. Each malware is displayed as a link, which, if selected, redirects you to a data sheet describing the detected malware. The data sheet includes the name and a short description of the detected malware, what it does, and the recommended removal method/s.
The options available to the user are configured by the administrator on the ESOD server.The options are listed in the following table:
To continue with the download:
Importing a Client Certificate with the Microsoft Certificate Import Wizard to Internet Explorer
Importing a client certificate to Internet Explorer is acceptable for allowing access to either a home PC with broadband access, or a corporate laptop with a dial-up connection. The client certificate will be automatically used by the browser, when connecting to an SSL Network Extender Security Gateway.
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Uninstall on Disconnect
If the administrator has configured Uninstall on Disconnect to ask the user whether or not to uninstall, the user can configure Uninstall on Disconnect as follows.
To set Uninstall on Disconnect:
Using SSL Network Extender on Linux / Mac Operating Systems
There are two methods to access Network Applications using Linux:
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Command Line
To download the SSL Network Extender installation archive package:
SSL Network Extender Command Attributes
Configuration File Attributes
It is possible to predefine SSL Network Extender attributes by using a configuration file (
.snxrc ) located in the users home directory. When the SSL Network Extender command SSL Network Extender is executed, the attributed stored in the file are used by the SSL Network Extender command. To run a file with a different name execute the command snx -f <filename> .
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Note - Proxy information can only be configured in the configuration file and not directly from the command line.
Removing an Imported Certificate
If you imported a certificate to the browser, it will remain in storage until you manually remove it. It is strongly recommended that you remove the certificate from a browser that is not yours.
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To remove the imported certificate:
Troubleshooting SSL Network Extender
The following sections contain tips on how to resolve issues that you may encounter when using SSL Network Extender.
Checkpoint Security Vpn ClientSSL Network Extender Issues
All user's packets destined directly to the external SSL Network Extender Security Gateway will not be encrypted by the SSL Network Extender.
If there is a need to explicitly connect to the gateway through the SSL tunnel, connect to the internal interface, which is part of the encryption domain.
ESOD Issues
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